JavaScript weakMap.get() Method

Below is the example of weakMap.get()() method.

• Example:

  <script>
      function gfg() {
  
  const weakmap1 = new WeakMap();
  
  const key1 = {};
  
  weakmap1.set(key1, 12);
  
  document.write(weakmap1.get(key1));
      }
      gfg();
  </script>
• Output:

  12

The weakMap.get() is an inbuilt function in JavaScript which is used to return a particular element from a object WeakMap.

Syntax:

weakMap.get(key);

Parameters: It accepts a parameter “key” which is the key of the element which is going to be returned from the object weakmap.

Return values: It returns the element which is associated with the particular key in the WeakMap object and it returns undefined if the key can not be found.

Example:

Input: weakmap1.get(key1)
Output: 42

JavaScript code to show the working of weakmap() function:
Code #1:

<script>

   // Creating a WeakMap() object
   const weakmap1 = new WeakMap();

   // Creating a key "key1"
   const key1 = {};

   // setting value 42 with key "key1" in the
   // object weakMap
   weakmap1.set(key1, 42);

   // Getting the specified elements i.e, 42
   document.write(weakmap1.get(key1));

</script>

Output:

42

Code #2:

<script>

   // Creating a WeakMap() object
   const weakmap1 = new WeakMap();

   // Creating a key "key1"
   const key1 = {};

   // Getting the specified elements
   document.write(weakmap1.get(key1));

</script>

Output:

undefined

Here output is undefined because the key “key1” has not been set at the end of the weakMap object.

Supported Browsers:

• Google Chrome 36 and above
• Edge 12 and above
• Firefox 6 and above
• Internet Explorer 11 and above
• Opera 23 and above
• Safari 8 and above